Pumping-head.



J. L. BOICOURT.

PUMPING HEAD.

APPLICATION FILED JULY 11.1913.

Patented Nov. 17', 1914.

@mento/z JOHN L. ICOURT. DE FOR-T -WORTH. TEXAS.

PUMPING-HEAD.

Application filed July 11, 1913.

[0 au 'w/'wm- It muy, concern.'

Be it known that I, JOHN L. Boicoun'r7 a citizen of the United States. residing at Fort Wvorth, in the county of Tarrant and State of Texas, have invented certain new and useful Improvements in Pumping- Heads, of which the following is a specification.

This invention relates to improvements in pump heads and particularly toa construction which is adapted to drive two piston rods in opposite directions, and the objects of this invention are to eliminate the rigid guides and consequently the friction on the guides, to provide rolling contact guides for the piston reds whereby-a vertical pull onc the rods is assured without friction, to provide a construction that will give a slow up stroke of piston rods and a quick down stroke of piston rods, to produce a continuous displacement in the pumping cylinder, to provide a construction that will overcome dead centers and prevent back lash on gears, to permit the piston rods to fall by gravity, thus requiring no power to force them down, to provide a greater flexibility on said piston rods arl stuffing boxes, causing less wear less f :tion on the same, and to provide a construction in which broken parts are easiljf' replaced and will not cause a breakage of the other parts.

@ther objects and advantages will be fully explained and the invention will be more particularly pointed out in the claims.

Reference is had to the accompanying drawings 'which form a part of this application.

Figure l is a side elevation of the pump head. Fig 2 is a front ,elevation of thel same, looking at the right side of Fig. 1. Fig. 3 is a side elevation of a rocker arm, showing a variation for the connection of the pump rods to the rocker arms. Fig. t is a plan View of the pump head shown in Figs. l and 2. Fig. 5 is a vertical section of roller bearings, being a variation from the bearings shown in the previous vit-ws. Fig. 6 is a broken plan View showing application of the rollers shown in Fig. 5. plan View of the rollers shown in Fig. 5.

Similar' characters of reference are used to indicate the same parts throughout the several views.

The pump head is provided with a frameA which may be cast With the cross bars 23, nprights 24 and 25, bearing arms Q6 and Specilication. of Letters Patent.

Fig. 7 is a Patented Nov. i7, 1914. Serial No. 778,530.

bars 27, all integral. A pivot shaft 4: is Journaled in the arms 2G. A power shaft E51 is journaled in suitable bearings formed in the frame pieces A power pulley 33 is mounted on the shaft 3l for driving the same and pinions il() are rigid with the shaft 3l and these pinionsl drive cog wheels 29 which are rigid with the crank shaft 6. The crank shaft G is Iiournaled in bearings 54 which are provided at the upper ends of the uprights 211. and 2;?. Rocker arms 1, 2 and il are pivotally mounted on the shaft The rocker arm 2 is operated b v the crank shaft 6. The crank shaft (3 has airoller bearing 21 and the rockc' arm 2 has a slot 3G therein for movement of roller 2l on the crank shaft G. The inner piston rod l1 is operated by the rocker arm 2. The rod 1l has a head 20 and a cable l5 is connected to the head 2O and to the upper side of the rocker arm i3. rl`hc rocker arm 2 has the free end curved. forming an arc relative to the pivot shaft -1 and the cable 15 lics in a groove in the outer or free end of the rocker arm 2. The cable l5 is attached to the rocker arm by inserting the upper end of the cable 15 in a socket 1S and fastening 1n the socket by pouring in a cast of lead. Rocker arms l and 3 are also pivotally mounted on the pivot shaft l. These rocker arms arc cui-red at their outer or free. ends` similar to the rocker arm 2. The outer pis! ton rod ll) is connected to a cross head The cross hard H is connected to the rocker arms l and 3 by means of a cable which has one ar1n l.l connected to the rocker arm l b v means of a leaded socket 1T, and the other arm 1G of thccablc isconnccted lo the rocker arm 3 by means of a leaded socle-t 111. similar to the leaded socket 1S.

lfig. 2 illustrates hcw dic cable supports the cross hcad i* which driics thc outer pist .o rod 10. The :arms 1 and il are Operated bv means of crank pires 3 and l which are rigid with the cog wheels di). The crank pins 5 and T are provided with roller oe-arings 21 which run in slots lo in the rocker arms l and 3. The crank pins 5 and T must be diametrically opposite the journals of cran'k shaft (i. or in other words, he 18() degrees from the journal on crank shaft (l. Rocker arms 1 and 3 have slots therein similar to the slet in the rocker arms l and Il and theI rollers 21 for the crank pins 5 and T under the surfaces 22, which surfaces are the upper walls of the slots in the rocker arms. rirhe crank pins 5 and 'T are in line and operate together and are located directly opposite the crank shaft 6 so that when the crank shaft is rotated rocker arms l and 3 are lifted as a. unit and allowed to fall by their own weight in the same manner. Rocher arm is lifted While rocker arms l and 3 are passing downward. Rocker arms l and 3 carry cross head 8 which is attached to the outer or hollow piston rod l0. Rocker arm 2 carries the inside piston rod ll.. iffrom this it will be seen that the two pis ton rods i() and ll are caused 'to operate generally irl-opposite directions, but since the crank shaft is operated in an anti-clock- Wise direction, it will he seen that the c'ranlr pins 5, and T throughout their upward movement describe an arc which lies at a greater distance from the tulcrum i than the arc described by these cranirs on their downward strokes, and since the crank pins move at a constant rate of speed, the Aupward movement of the rocker arms l, 2 and 3 is much slower and also for a longer duration of time than the downward stroke, so

that by this movement there is practically no interval of time, when at least one piston rod is not on the upward stroke. The free ends'oif the rocker arms l, and 3 are in the form or" an arc with the shaft -l as center. The piston rods l0 and ll are connected flexibly to the upper ends. of the arcs,` and roll upon the arc as the rocker arms are oscillated. By this means it will be seen that the piston rod or its connection which comes in contact with the arc by the rocker arms is held at its lowest point or' contact 13 with the are at an exact constant distance from the stationary point i. The groove in the face of the free ends oil the rocher arms retains the cables li, 15 and 'lo in position so that there is a rocking contact of the rocker arms against the cables and the lowest point of contact i3 will always ne in a direct vertical position over the piston rods, so-tha't there will oe no leaning ot' the piston rrods while in operation, but will move in an unvarying vertical position. This will 'prevent friction ol the piston rods against the pumping` cylinder or casing 3T. The inner and outer pumping rods arc driven in opposite directions vby reason of the connections of the inner piston rod to the rocker arm 2 and the connection of the outer piston rod to the rocker arms l and 3 and the connection of these rocker arms with the crank-shaft 6 and the connection of the crank shaft to the driving cog Wheels 29, and being connected to said gearing on diametrically opposite sides thereof.

A variation is shown in Fig. nstead of the cables which connect piston rods to the rocker arms, link bars G may be pivotally connected to the rocker arm by pivot bolts @and at the lower ends the links G- 1,1 more are pivotally connected to piston rods H by means of pivot bolts l. The rocker arm has the same curved outer edge and the link bars G will swing on each side of the rocker arm so that a rolling Contact guide is secured by the piston rod to maintain the piston rod in an anvar-ying vertical position during operation.

Figs. 5, 6 and Y illustrate a variation in the roller bea ings which operate in the rocker arms. A bearing box C is provided with a bearing for the crank shaft (i. rilhe bearing for the crank shaft 6 may loe connected to the bearing box C .by a detachable member il which is bolted thereto. bearings A and B are mounted on shafts D and E which are journaled in the bearing box These roller hearings will the place of roller bearings 2l. The oon C will serve as an oilcup for oiiing the rollers A and B and also crank shaft G by reason of a small aperture M in the bearing boxr C. Thus the pair of arms l and 3 will be raised 'vertically by the crank pins 5 and T while the rocker arm 2 will descend by reason of the crank shaft G, and when the crank shaft 6 raises the rocker arm i2 in a vertical direction, the rocher arms l and 3 will be moving downward.

The form of the rocker arms l, 9., and 3 may vary. The parte below the roller bearings 2l of the crank or pins are not necessary to the operation/,and may be dispensed with. .in important feature of the rocker arms is that there/must be a curved sur; face to form the roller contact guide ttor each piston rod. lt is apparent that the same kind of rocher arm can be for guiding a single piston rod. ^ny suitable trame may be provided which shall have the necessary bearings for the rocker arms and the gearing. Other changesmay be made without departing from my invention. instead ot' the crank pins 5 and l", the crank shaft G may be provided with cranks for operating thcroclrer arms .l and 3.

What l claim isfl. in a pumping head, oppositely driven piston rods and means 'tor driving and guiding said piston rods in their vertical movenicnt consisting of rocker arms pivoted et one end and having the other ends curved Vtraining arcs relative to said pivoted ends and operatively connected to said piston rods and causing unvarying vertical mon tion ot said piston rods and gearing provided with crank pins and a crank shaft for operating said rocker arms. j

ln a pump head, piston rods adapted to be oppositely driven, rocker arms pivoted at one and having the other ends formed into arcs relative to the piroted ends and means connecting said piston rods to the upper sides ot said curved ends, and seid curved ends forming roller contact Roller Jfor causing direct vertical pull on said piston rods and gearing provided with a. crank sii-Lift and crank pins for operating said rocker urine and causing slower upstrokes ns and gjierniitting ristn down iid urines ziiterimtely.` 1J. in i pump head, piston rods adapted onol 'g driveinrooker arms for i i piston rode, pivoted it one end und inning the free ends; extended to the iine oit rrnvei o" 'd pieton rods, ineuns or iiexibiv :iiiuziiiin nid piston rods to id .i'ree ends, und ineiins tor driving said rooker zii-ins eonsisting,l oi gering provided vfiih :i omni; shut't und crank pino o;ie.;:tiveij, engaging said urine and pri f uiiovo und below the centers of tire gern' nire-eis und alternately oeufsing eiovfer und ii-,eter strokes of said arms. i. in u pinnp hond, pieton rode adapted to be oppositeilji' driven, rocker urine pivoted ut one end :ind liuving the other ends curved nd formed into irte relative to their pivoted ends, said curved ends Cruising direc-t vertieni motion of sind piston rods, means iiexibiv attaching said piston rods to the upper siiiee of said curved rocker arms, and

ineens for driving said rocker firms consisting of ai Grunt: 'snuit for driving the rentifui rocker urni, and geur wheels having crank pins for driving the outer rocker iii'iib.

3n in n pump bend. piston rods adapted to be oppositeiy driven and fonsieting of an inner piston rod und un ourifpiston rod, n. puir rocker :irine iiifotniiy mounted :it one end und inning their free endel Curved und formed into :iro pif 'eintive to tiroir d ends. ineuns for flexibly connecting id outer piston rod to said rocker ii-ins, :i eentrzii rocker :irin VEiirotuli'v mounted :it one end ono loving the. other und Curved :2nd formed into :in :rrr reiuriio io the pivotrd end. :nouns for lioxibiy eminent-ing the i fuor pieren rod 2o anni rontrai roriaer urni, i ie oui-ved ends oi' solo roei Unis causing iii-ori; iorrieui motion oE-sziid piston rods, und menne for driving sindA rocker urnis oonsisting of gear v'neeis and :i crunk :for Suid geen' iviieeis operatively connected to :1nd un the Central rocker zirin, und crunk pins on snif geur wheels operatively connected to the outer pair of rocker arms.

C. In u pun'ip heed an inner piston rod outer piston rod adapted to be oppoeiteiy driven, rocker urine consisting of n. pun' oi' outer iirnis und i centi-:ii erin all pivoted ut one end und having their free ends our-rd und iornied into zii-os relative to their pir-oued ende, ineens .for tiexibiy oonnerting die inner pump rod to the contrai rocker erin, incarne for iiexiolv Connecting Lire outer pump rod to the outer rocker zinns, the our\ ed ends of the rocker :irnis Causing dir-oei, vertical motion of said pieton rods, .ind ineens for driving smid rocker arms consisting; oifigenring provided with. ai crunk huit operzitiveiy connected to the contrai rocker erin, :rnd sind gearing provided with erunii pins operatively connected to the oiuier rocker zii-nis, said rocker arms having longitudirnii slots therein for said crunk snuit :ind for sind crunk pins, and roller bearings for Suid crunk shaft :ind crank pinl to prevent friction iigainsteaid rocker :1i-ins. l

T. n n. pump head, piston rods, rocker nrnis having ai oonnnon pivotal bearing nt one end and havin"t curved surfaces ermeing direct vertioiii motion of Suid piston rodeA for nmint ining direct vertical pull of Suid piston rode, means for iieribiy oornoeting Suid piston roos to Suid rocker iii-ins, :ind menne for drivingA seid rocker .n1-nis consisting' oi" geur wheeis und al (Ei-:ink sin ift fing-retor, seid crank siiaif't operatively en gaining one ot Suid arms. und crank pins rigid with .mid gozzi.' wheoi und operutiveiy rei the other urine, the points of engogr mit with Suid :mns passing downrruv-riiv between the siinitr oil .r1-.iii vfi'ieoie :ind sind pouring und p-ieeing iipivnrdiy on iie opposite side of shaft.

in testimony \\'iiereof, I set 'uy tile presence oi two witnesses, tins oth iii Juiv 1913,

i Joi-ir L. Boioonnfr.

.Monson nos SLEY. 

